I was prescribed 25 mg of nortriptyline for migraines and for chronic pain due to a car accident. I took it for 9 days and was dizzy and constantly exhausted. I found myself falling asleep sitting up. When I spoke with the doctor he told me to stop taking it immediately. Now I am lightheaded and have had a splitting frontal headache (my migraines have been centered in my right temple for the last 30 years). Does anyone know how long I should expect to feel like this?